Ext.onReady(function() {

			Ext.QuickTips.init();

			var reader = new Ext.data.JsonReader({
						root	: 'fullname',
						fields	: [{
									name	: 'lname'
								}, {
									name	: 'fname'
								}]
					});

			var store = new Ext.data.Store({
						autoLoad	: true,
						reader		: reader,
						proxy		: new Ext.data.HttpProxy({
									url		: 'ds.json',
									method	: 'GET'
								})
					});

			var combo = new Ext.form.ComboBox({
						store			: store,
						displayField	: 'lname',
						typeAhead		: true,
						mode			: 'local',
						forceSelection	: true,
						triggerAction	: 'all',
						emptyText		: 'Select ...',
						selectOnFocus	: true
					});

			var reader2 = new Ext.data.JsonReader({
						root	: 'age',
						fields	: [{
									name	: 'birth'
								}, {
									name	: 'age'
								}]
					});

			var store2 = new Ext.data.Store({
						autoLoad	: true,
						reader		: reader2,
						proxy		: new Ext.data.HttpProxy({
									url		: 'ds.json',
									method	: 'GET'
								})
					});

			var combo2 = new Ext.form.ComboBox({
						store			: store2,
						displayField	: 'birth',
						typeAhead		: true,
						mode			: 'local',
						forceSelection	: true,
						triggerAction	: 'all',
						emptyText		: 'Select ...',
						selectOnFocus	: true
					});

			new Ext.Viewport({
						layout	: 'fit',
						items	: [combo, combo2]
					});

		});